近年來，隨者網路科技快速的發展，製造技術的進步，讓我們無論是在線上通
路或是線下通路，現在取得產品愈來愈容易。然而，正當我們享受著科技進步的同
時，許多使用過的產品卻會對環境造成很大的傷害。也正因如此，環境保護、回收、
閉鎖式供應鏈的觀念也逐漸被學界及工業界所提倡。在本文中，我們延伸了一個基
於經濟訂貨量的模型，由消費者、回收商、回收處理組成的供應鏈系統。把回收商
視為決策者，只負責舊品回收且不參與再製造。將回收商的目標設定為利潤最大化
問題，最佳的產品回收價格及銷售量為決策變數。並在本篇論文中找出了最佳解。
此外，增加了回收努力後，為了求出最佳解，開發了一個有效的迭代演算法來找到
最佳解決方案，並提供一些數值例子來說明該模型及演算法的特點。

In recently years, with the rapid development of information technology and
manufacturing technology, it has become more easier to obtain products through online
or offline. However, with the convenience, many used products may cause serious effect
to the environment. Therefore, the concept of environmental protection, recycle, and
close-loop supply chain (CLSC) are advocated in the industrial and academic
communities. In this paper, we propose a model base on economic order quantity (EOQ),
and a supply chain consists of consumer, recycler, and the recyclable dealer. We assume
that recycler is the decision maker who is solely in charge of collecting used products and
is not involved in remanufacturing. Besides, we assume that the purpose problem of
recycler is profit-maximization, the optimal recycle price and collecting quantity of used
products are the decision variables. The optimal close-form solutions can be obtained in
this paper. In addition, we consider that recycle effort is also one of the decision variables
and add it into the model. In order to find the optimal solutions, we investigate an efficient
algorithm and provide several numerical examples.

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